Or try this one, that I once saw here on the list and use widely with labelling and tematic layers:
Int(popden>=0)*1+Int(popden>=1000)*1+Int(popden>=5000)*1+Int(popden>=10000) *1 I have simply added a Int() function to all your sub-expressions. HTH, Peter ------------------------------------------------------------------------------------------------ Peter Horsbøll Møller, GIS Udviklingskonsulent / GIS-Developer Kampsax A/S - GIS Software & Solutions Rugaardsvej 55, 5000 Odense, DK tel: +45 6313 5013, dir:+45 6313 5008, fax: +45 6313 5090 mailto:[EMAIL PROTECTED] www.kampsax-gis.dk and www.kampsax.dk Authorized MapInfo Partner & Distributor in Denmark and Norway. ------------------------------------------------------------------------------------------------ Klik ind på http://www.kortal.dk og se det hele lidt fra oven! ----- Videresendt af Peter Møller/Kampsax - 09-04-2002 08:56 ----- "DPC" <darrinclement@ne Til: "K Miller" <[EMAIL PROTECTED]>, tzero.net> <[EMAIL PROTECTED]> cc: 09-04-2002 03:16 Vedr.: RE: MI-L SQL query to group data on classifications Seems like you have 90% of it figured out. I'll assume your table is called MyTable and the field where you are storing your group sums is MyField [as a Char(4)]. If you take your last expression (where you get "TFFF" for up to 1,000, "TTFF" for 1,000 to 5,000, "TTTF" for 5,000 to 10,000, and "TTTT" for above 10,000, then all you have to do is: select * from MyTable where MyField = "TFFF" update selection set MyField = 1 select * from MyTable where MyField = "TTFF" update selection set MyField = 2 select * from MyTable where MyField = "TTTF" update selection set MyField = 3 select * from MyTable where MyField = "TTTT" update selection set MyField = 4 At least, this works for me. Good luck! DPC -----Original Message----- From: K Miller [mailto:[EMAIL PROTECTED]] Sent: Monday, April 08, 2002 4:50 PM To: [EMAIL PROTECTED] Subject: MI-L SQL query to group data on classifications Greetings, I am trying to write a SQL query to group my data (and provide group sums) on specific categories of a particular field. In particular, I'm trying to sum population by population density categories (< 1,000 people per square mile, 1,000 - 5,000 ppsm, 5,000 - 10,000 ppsm, > 10,000 ppsm). I thought I could use an expression in the "select columns" portion of the SQL query, but I am coming up against a brick wall. I tried using an expression such as (popden>=0)*1+(popden>=1000)*1+(popden>=5000)*1+(popden>=100 00)*1 in the hopes that it would give me "1" for up to 1,000, "2" for 1,000 to 5,000, "3" for 5,000 to 10,000, and "4" for above 10,000, but MI complains about a datatype mismatch (it doesn't treat a logical as a number). Any suggestions? Ways to convert between a "True" and a 1? Other ways to go about this? I'd rather not create a new column in the table and set it's value. I'd like the solution to be more dynamic than that. For now, my only hope is an expression in the following form: str$(popden>=0) & str$(popden>=1000) & str$(popden>=5000) & str$(popden>=10000) which gives me "TFFF" for up to 1,000, "TTFF" for 1,000 to 5,000, "TTTF" for 5,000 to 10,000, and "TTTT" for above 10,000. Not my ideal solution, but at least it works. Thanks in advance for your help, and I'll SUM any other solutions I might come across. ------------------------------------------------------------ ------------ Keith Miller Principal Planner: GIS and Modeling North Jersey Transportation Planning Authority, Inc. One Newark Center, 17th floor Newark, NJ 07102 973-639-8444 [EMAIL PROTECTED] ____________________________________________________________ _____ Send and receive Hotmail on your mobile device: http://mobile.msn.com ------------------------------------------------------------ --------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
